公开(公告)号：US11612960B2

公开(公告)日：2023-03-28

申请号：US17864176

申请日：2022-07-13

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhubin He ,  Jiangkai Liang ,  Wei Du ,  Xinyu Hu ,  Yi Xu

IPC: B23K26/342 ,  B23K26/082 ,  B23K26/70 ,  B21B47/00 ,  B21B37/24 ,  B33Y50/02 ,  B33Y10/00 ,  B33Y40/20

Abstract: Laser additive manufacturing and a method for preparing thin-walled preforms by laser metal deposition and follow-up rolling. This can solve the problems that when the existing laser metal deposition technology prepares the thin-walled preforms, the limit width size of a molten pool at high power affects the forming wall thickness of the preforms so that it is difficult to prepare preforms with wall thickness less than 2 mm, and the problems of poor surface quality and low accuracy of preforms due to convex and concave peaks caused by the interlayer overlapping, but also can solve the problems that a laser beam with a preset trajectory cannot act on the end surfaces of the preforms due to preform deformation caused by residual stress in a printing process so that the preforms cannot be continuously formed.

公开(公告)号：US11413675B2

公开(公告)日：2022-08-16

申请号：US16937660

申请日：2020-07-24

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhubin He ,  Yanan Li ,  Yanli Lin ,  Xinyu Hu ,  Linwei Leng ,  Shijian Yuan

IPC: B21D26/041 ,  B21D26/045 ,  B21D26/049

Abstract: A method and device for manufacturing a large-sized thin-walled tubular part by gas-liquid internal high pressure forming (IHPF). A gas and a liquid are filled at a certain volume ratio into a thin-walled blank. The pressure of the gas-liquid mixed fluid is mainly determined by the gas pressure. During the deformation of the thin-walled blank, due to a large compression ratio of the gas, the gas-liquid pressure will not basically change with the change of the volume of a blank cavity. A support pressure on the cavity of the thin-walled blank is stable in the entire forming process. In addition, even if there is a slight leakage of the liquid or gas during the forming process, the medium pressure inside the blank will not fluctuate largely. In this way, embodiments lower the requirements for the sealing effect during the tubular part forming process.